Santa Ana pollen forecast — Mater Dei High School's Football Field neighborhood
Pollen Today
Today (20 September) pollen in Mater Dei High School's Football Field, Santa Ana is high; ragweed is high; grass is moderate; mugwort is low.
Pollen Tomorrow
Tomorrow (21 September 2026) ragweed remains high, grass declining, mugwort no longer expected.
7-Day Trend
Over the next week grass, mugwort, and ragweed will increase.
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Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | None | 0/100 |
| Grass (Poaceae) | Moderate | 37/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Low | 8/100 |
| Ragweed (Ambrosia) | High | 70/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | None | 0/100 | — |
| Grass (Poaceae) | Low | 25/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | None | 0/100 | |
| Ragweed (Ambrosia) | High | 61/100 |
Local Environmental Conditions
Mater Dei High School's Football Field is set in the Santa Ana suburban landscape of Orange County, with introduced olive, mulberry, and eucalyptus as the main surrounding tree pollen sources alongside coastal sage scrub. The mild Southern California Mediterranean climate advances the season and the marine layer can periodically suppress pollen dispersal, while grass peaks through spring and mugwort extends into September throughout.
Mater Dei High School's Football Field's pollen season lines up with the rest of Santa Ana, starting with olive and acacia in January then eucalyptus follows, running through February. Grass pollen rises through March and April, and mugwort extends exposure into September. Onshore Pacific breezes periodically clear the air, though inland valleys can still see elevated counts, a pattern felt across this part of Santa Ana.
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Resource Hub
Pollen forecast neighborhoods 5 neighborhoods
Sports venues in Santa Ana 1 sports venue
Frequently Asked Questions About Pollen in California
Is pollen high in Santa Ana right now?
On 20 September 2026, overall pollen levels in Santa Ana are high. Ambrosia is the main contributor to airborne pollen, while grass and artemisia remain at lower levels
Will pollen levels change in Santa Ana tomorrow?
On 21 September 2026, pollen conditions in Santa Ana will be different from today, with ambrosia at high levels and grass continuing to decline
Is pollen expected to decrease in Santa Ana this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.
Which pollen types are currently active in Santa Ana?
On 20 September 2026, Ambrosia is the dominant pollen source in Santa Ana. grass and artemisia are also present but at lower levels.
When is pollen season in Santa Ana?
How often is the Santa Ana pollen forecast updated?
The Santa Ana pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Santa Ana come from nearby or far away?
Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.
Are pollen levels in Santa Ana based on measurements or forecasts?
Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.
Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Santa Ana, modern forecasts combine recent measurements, weather data, and information about local vegetation.
This allows us to estimate pollen levels for today and the coming days, not just report the past.
Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
